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can: error: add definitions for the different CAN error thresholds

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Currently, drivers are using magic numbers to derive the CAN error
states from the error counter. Add three macro declarations to
remediate this.

For reference, the error-active, error-passive and bus-off are defined
in ISO 11898, section 12.1.4.2 "Error counting". Although ISO 11898
does not define error-warning state, this extra value is also commonly
used and is thus also added.

Link: https://lore.kernel.org/all/20220719143550.3681-13-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Vincent Mailhol 2022-07-19 23:35:50 +09:00 • committed by Marc Kleine-Budde
parent 3e5c291c79
commit 3f9c26210c
1 changed files with 13 additions and 0 deletions
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13
include/uapi/linux/can/error.h
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@ -127,4 +127,17 @@
/* TX error counter / data[6] */
/* RX error counter / data[7] */
/* CAN state thresholds
*
* Error counter Error state
* -----------------------------------
* 0 - 95 Error-active
* 96 - 127 Error-warning
* 128 - 255 Error-passive
* 256 and greater Bus-off
*/
#define CAN_ERROR_WARNING_THRESHOLD 96
#define CAN_ERROR_PASSIVE_THRESHOLD 128
#define CAN_BUS_OFF_THRESHOLD 256
#endif /* _UAPI_CAN_ERROR_H */